Datasheet

MAX703/MAX704
Low-Cost Microprocessor Supervisory
Circuits with Battery Backup
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +4.75V to +5.5V for MAX703, V
CC
= +4.5V to +5.5V for MAX704, V
BATT
= 2.8V, T
A
= T
MIN
to T
MAX
, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Terminal Voltage (with respect to GND)
V
CC
....................................................................-0.3V to +6.0V
V
BATT
.................................................................-0.3V to +6.0V
All Other Inputs (Note 1).........................-0.3V to (V
CB
+ 0.3V)
Input Current
V
CC
...............................................................................200mA
V
BATT
..............................................................................50mA
GND ................................................................................20mA
Output Current
V
OUT
...............................Short-Circuit Protected for Up to 10s
All Other Outputs ............................................................20mA
Rate-of-Rise V
BATT
, V
CC
.................................................100V/µs
Operating Temperature Range
C Suffix................................................................0°C to +70°C
E Suffix.............................................................-40°C to +85°C
M Suffix ..........................................................-55°C to +125°C
Continuous Power Dissipation (T
A
= +70°C)
8-Pin PDIP (derated 9.09mW/°C above +70°C) ..........727mW
8-Pin SO (derated 5.88mW/°C above +70°C) .............471mW
8-Pin CERDIP (derated 8.00mW/°C above +85°C) .....640mW
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1: V
CB
is the greater of V
CC
and V
BATT
. The input voltage limits on PFI and MR may be exceeded if the current into these pins
is limited to less than 10mA.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range
V
CC
, V
BATT
(Note 2) 0 5.5 V
MAX70_C 200 350
Supply Current (Excluding
I
OUT
)
I
SUPPLY
MAX70_E/M 200 500
µA
T
A
= +25°C 0.05 1.0
I
SUPPLY
in Battery-Backup
Mode (Excluding I
OUT
)
V
CC
= 0V, V
BATT
=
2.8V
T
A
= T
MIN
to T
MAX
5.0
µA
T
A
= +25°C -0.10 +0.02
V
BATT
Standby Current
(Note 3)
5.5V > V
CC
> V
BATT
+ 0.2V
T
A
= T
MIN
to T
MAX
-1.00 +0.02
µA
I
OUT
= 5mA
V
CC
-
0.05
V
CC
-
0.025
V
OUT
Output
I
OUT
= 50mA
V
CC
-
0.5
V
CC
-
0.25
V
V
OUT
in Battery-Backup
Mode
I
OUT
= 250µA, V
CC
< V
BATT
- 0.2V
V
BATT
-
0.1
V
BATT
-
0.02
V
Power-up 20
Battery Switch Threshold
(V
CC
- V
BATT
)
V
CC
< V
RST
Power-down -20
mV
Battery Switchover Hysteresis 40 mV
MAX703 4.50 4.65 4.75
RESET Threshold V
RST
MAX704 4.25 4.40 4.50
V
RESET Threshold Hysteresis 40 mV
RESET Pulse Width t
RST
140 200 280 ms
V
OH
I
SOURCE
= 800µA
V
CC
-
1.5
I
SINK
= 3.2mA 0.4
MAX70_C, V
CC
= 1V, V
CC
falling,
V
BATT
= 0V, I
SINK
= 50µA
0.3
RESET Output Voltage
V
OL
MAX70_E/M, V
CC
= 1.2V, V
CC
falling,
V
BATT
= 0V, I
SINK
= 100µA
0.3
V